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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#include "plugin.hxx"
#include "check.hxx"
#include "compat.hxx"
#include <iostream>
#include <unordered_map>
#include <unordered_set>
#include <vector>
/**
Look for fields which are const, which can be made static const
*/
namespace
{
class StaticConstField : public loplugin::FilteringPlugin<StaticConstField>
{
public:
explicit StaticConstField(loplugin::InstantiationData const& data)
: loplugin::FilteringPlugin<StaticConstField>(data)
{
}
void run() override;
bool TraverseConstructorInitializer(CXXCtorInitializer* init);
bool TraverseCXXConstructorDecl(CXXConstructorDecl* decl);
private:
struct Data
{
std::vector<CXXCtorInitializer const*> inits;
std::string value;
};
std::unordered_map<FieldDecl const*, Data> m_potentials;
std::unordered_set<FieldDecl const*> m_excluded;
CXXConstructorDecl* m_currentConstructor = nullptr;
};
void StaticConstField::run()
{
std::string fn = handler.getMainFileName();
loplugin::normalizeDotDotInFilePath(fn);
// unusual case where a user constructor sets a field to one value, and a copy constructor sets it to a different value
if (fn == SRCDIR "/sw/source/core/attr/hints.cxx")
return;
if (fn == SRCDIR "/oox/source/core/contexthandler2.cxx")
return;
TraverseDecl(compiler.getASTContext().getTranslationUnitDecl());
for (auto const& pair : m_potentials)
{
report(DiagnosticsEngine::Error, "const field can be static", pair.first->getLocation())
<< pair.first->getSourceRange();
for (CXXCtorInitializer const* init : pair.second.inits)
if (pair.first->getLocation() != init->getSourceLocation())
report(DiagnosticsEngine::Note, "init here", init->getSourceLocation())
<< init->getSourceRange();
}
}
bool StaticConstField::TraverseCXXConstructorDecl(CXXConstructorDecl* decl)
{
auto prev = m_currentConstructor;
m_currentConstructor = decl;
bool ret = FilteringPlugin::TraverseCXXConstructorDecl(decl);
m_currentConstructor = prev;
return ret;
}
bool StaticConstField::TraverseConstructorInitializer(CXXCtorInitializer* init)
{
if (!init->getSourceLocation().isValid() || ignoreLocation(init->getSourceLocation()))
return true;
if (!init->getMember())
return true;
if (!init->getInit())
return true;
if (!m_currentConstructor || m_currentConstructor->isCopyOrMoveConstructor())
return true;
if (!m_currentConstructor->getParent()->isCompleteDefinition())
return true;
if (m_excluded.find(init->getMember()) != m_excluded.end())
return true;
auto type = init->getMember()->getType();
auto tc = loplugin::TypeCheck(type);
if (!tc.Const())
return true;
bool found = false;
std::string value;
auto const initexpr = compat::IgnoreImplicit(init->getInit());
if (tc.Const().Class("OUString").Namespace("rtl").GlobalNamespace()
|| tc.Const().Class("OString").Namespace("rtl").GlobalNamespace())
{
if (auto constructExpr = dyn_cast<CXXConstructExpr>(initexpr))
{
if (constructExpr->getNumArgs() >= 1
&& isa<clang::StringLiteral>(constructExpr->getArg(0)))
{
value = dyn_cast<clang::StringLiteral>(constructExpr->getArg(0))->getString();
found = true;
}
}
}
else if (type->isFloatingType())
{
APFloat x1(0.0f);
if (initexpr->EvaluateAsFloat(x1, compiler.getASTContext()))
{
std::string s;
llvm::raw_string_ostream os(s);
x1.print(os);
value = os.str();
found = true;
}
}
// ignore this, it seems to trigger an infinite recursion
else if (isa<UnaryExprOrTypeTraitExpr>(initexpr))
;
// ignore this, calling EvaluateAsInt on it will crash clang
else if (initexpr->isValueDependent())
;
else
{
APSInt x1;
if (compat::EvaluateAsInt(initexpr, x1, compiler.getASTContext()))
{
value = x1.toString(10);
found = true;
}
}
if (!found)
{
m_potentials.erase(init->getMember());
m_excluded.insert(init->getMember());
return true;
}
auto findIt = m_potentials.find(init->getMember());
if (findIt != m_potentials.end())
{
if (findIt->second.value != value)
{
m_potentials.erase(findIt);
m_excluded.insert(init->getMember());
}
else
findIt->second.inits.push_back(init);
}
else
{
Data& data = m_potentials[init->getMember()];
data.inits.push_back(init);
data.value = value;
}
return true;
}
loplugin::Plugin::Registration<StaticConstField> X("staticconstfield", true);
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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